Jan J. Verstraete

Jan J. Verstraete
IFP Energies nouvelles · Process Design and Modeling Division

Ph.D. in Chemical Engineering

About

76
Publications
10,914
Reads
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1,300
Citations
Additional affiliations
February 1999 - present
IFP Energies nouvelles
Position
  • Project Manager
September 1990 - November 1994
Ghent University
Position
  • PhD Student
Description
  • PhD thesis on "Kinetic Modeling of Catalytic Reforming of Naphtha"
Education
September 1990 - October 1994
Ghent University
Field of study
  • Department of Chemical Engineering
October 1987 - June 1990
Ghent University
Field of study
  • Department of Chemical Engineering
October 1983 - June 1987
Provinciale Industriële Hogeschool
Field of study
  • Department of Biochemistry

Publications

Publications (76)
Article
Nitrogen Sorption, Mercury Porosimetry, and Nuclear Magnetic Resonance Cryoporometry are characterization techniques used to obtain qualitative and quantitative information about the textural properties of porous materials. The physical phenomena exploited in each technique are related to mechanical and thermodynamic equilibria and are conditioned...
Article
A Monte Carlo approach is used to generate 2D and 3D networks of randomly connected cylindrical pores with a variety of configurations. These networks are used to represent the gamma‐alumina supports of hydrotreating catalysts. Textural properties from generated pore networks are compared with experimental values of porosity, specific surface area,...
Chapter
Nitrogen porosimetry is a characterization technique used to obtain qualitative and quantitative information about the textural properties of porous materials. The physical phenomena exploited in the technique is related to thermodynamic equilibrium and conditioned by pore blocking. The latter phenomenon becomes relevant in highly disordered solids...
Article
Lignocellulosic biomass can be used as a source of hydrocarbons after an initial transformation by one of three different routes: biochemical conversion, chemical conversion and thermochemical conversion. In the last class, one of the possible approaches is fast pyrolysis, a process in which the biomass is exposed for a short time at high temperatu...
Article
The tortuosity factor of γ-alumina supports and catalysts used in hydrotreating applications was evaluated in liquid phase with three different techniques: Pulse Field Gradient-NMR (PFG-NMR), Inverse Liquid Chromatography (ILC) and catalytic experiments in a batch reactor. In order to satisfy the specific experimental constraints associated to each...
Chapter
Lignocellulosic biomass, like oil fractions, is a source of hydrocarbons. The transformation from biomass to liquid hydrocarbons passes by several processes: pre-treatment, conversion, followed by post-treatment. In one of the possible transformation schemes, the biomass undergoes fast pyrolysis, and the produced bio-oils are upgraded through hydro...
Article
Lignocellulosic biomass, like oil fractions, is a source of hydrocarbons. The transformation from biomass to liquid hydrocarbons passes by several processes: pre-treatment, conversion, followed by post-treatment. In one of the possible transformation schemes, the biomass undergoes fast pyrolysis, and the produced bio-oils are upgraded through hydro...
Conference Paper
Catalytic reforming in petroleum refining aims at transforming naphta fractions into high octane gasoline containing aromatics or branched alkanes and to produce simultaneously hydrogen. The catalyst used is composed of platinum-based sub-nanometric clusters highly dispersed on gamma-alumina. These clusters exhibit fluxional character to hydrogen p...
Article
Inverse liquid chromatography experiments were performed on five mesoporous alumina catalyst supports with similar porosity and different pore size distributions. By varying the size of the molecular tracer, it was shown that the diffusion regime in our conditions is molecular diffusion. Hindered diffusion was not observed even for squalane, a C30...
Chapter
A two or three-dimensional pore network is randomly generated by a Monte Carlo approach to represent γ-alumina supports. The network porous structure is obtained by the random interconnection of cylindrical pores. The proposed model allows to correctly represent the catalyst support pore size distribution, the porosity and internal surface area. Tr...
Article
The increasing environmental constraints on oil products leads to the need for developing accurate models in order to predict the detailed performances of refining processes. In the current study, a stochastic two-step procedure using Monte Carlo techniques is applied to and validated on the hydrotreating of Light Cycle Oil (LCO) gas oils. In the f...
Article
Full-text available
In this paper, kinetic modeling techniques for complex chemical processes are reviewed. After a brief historical overview of chemical kinetics, an overview is given of the theoretical background of kinetic modeling of elementary steps and of multistep reactions. Classic lumping techniques are introduced and analyzed. Two examples of lumped kinetic...
Article
The most abundant metals in heavy feedstocks, vanadium and nickel, are mainly concentrated in the asphaltene fraction, a petroleum fraction that precipitates in the presence of paraffinic solvents. Characterization of vanadium and nickel complexes is therefore important to the development of demetalation and conversion strategies used to process he...
Patent
The invention relates to a method of hydroconverting in ebullated bed mode a petroleum feed containing a significant amount of light fractions and, among other things, asphaltenes, sulfur-containing and metallic impurities. More precisely, the object of the invention is a hydroconversion method using at least one ebullated-bed reactor for which inj...
Patent
Full-text available
For conversion of crude oil or a heavy hydrocarbon fraction having an initial boiling point of at least 300° C., conducting a catalytic hydroconversion in a three-phase reactor operating in a boiling bed with an upward flow of liquid and gas, separating resultant effluent into a light liquid fraction boiling at less than 300° C. and a heavy liquid...
Patent
Full-text available
Conversion of a heavy hydrocarbon fraction that is obtained either from a crude oil or from the distillation of a crude oil and that has an initial boiling point of at least 300° C. by hydroconversion of at least one portion of heavy hydrocarbon fraction in the presence of hydrogen in at least one three-phase reactor containing at least one hydroco...
Conference Paper
Fixed-bed resid desulfurization (RDS) is an important industrial catalytic process to produce low sulfur fuel oil and to pre-treat feed for further upgrading via resid fluid catalytic cracking (RFCC). The catalytic system is based on a complex stacking of task-specific catalysts. The catalysts sequence is more and more complex due to the number of...
Patent
The invention relates to a method for treating a hydrocarbons charge comprising the following stages, in which: a) the charge is brought into contact with a solvent in order to obtain a deasphalted effluent having a content of asphaltenes below 3000 ppm by weight, b) the deasphalted effluent is cracked in the presence of hydrogen and a hydrocracki...
Conference Paper
Full-text available
Over the last years, both the quality and the maximum allowable impurities content of refined products have been subject to increasingly more severe environmental constraints. This has driven research to develop improved hydrotreating processes. In order to correctly predict the process performances, the accuracy and reliability of the kinetic mode...
Article
Full-text available
A methodology for kinetic modeling of conversion processes is presented. The proposed approach allows to overcome the lack of molecular detail of the petroleum fractions and to simulate the reactions of the process by means of a two-step procedure. In the first step, a synthetic mixture of molecules representing the feedstock is generated via a mol...
Article
Full-text available
This work concerns the development of a methodology for kinetic modelling of refining processes, and more specifically for vacuum residue conversion. The proposed approach allows to overcome the lack of molecular detail of the petroleum fractions and to simulate the transformation of the feedstock molecules into effluent molecules by means of a two...
Patent
The present invention describes a reaction zone comprising at least two fluidized reactors, a principal reactor for cracking a heavy hydrocarbon cut, the other, additional, reactor for cracking one or more light cuts, the effluents from the two reactors being treated in a common gas-solid separation and quench zone. Performance is enhanced because...
Article
A vacuum residue is a complex hydrocarbon mixture of several thousand different chemical species. Even today, no analytical technique is powerful enough to obtain the molecular detail that is required for the development of a detailed kinetic model. To overcome this drawback, a two-step reconstruction algorithm has been developed to build a represe...
Article
A novel kinetic modeling strategy for refining processes for heavy petroleum fractions is proposed. The approach allows to overcome the notorious lack of molecular details in describing the petroleum fractions. The simulation of the reactions process consists of a two-step procedure. In the first step, a mixture of molecules representing the feedst...
Article
This work concerns the development of a methodology for kinetic modeling of hydrotreating processes. The proposed approach allows to overcome the lack of molecular detail of the petroleum fractions and to simulate the reactions of the process by means of a two-step procedure. In the first step, a mixture of molecules representing the feedstock is g...
Conference Paper
The present work focuses on the development of a novel kinetic modeling strategy for heavy oil conversion processes. The proposed approach allows to overcome the lack of molecular detail of the petroleum fractions and to simulate the reactions of a conversion process by means of a two-step procedure.In the first step, a mixture of molecules represe...
Article
This work concerns the study of sediment formation in ebullated-bed hydroconversion of vacuum residues and investigates ways to avoid their formation at high conversion operation. Tests were carried out in a bench-scale unit at high temperature using a vacuum residue feedstock. Feeds and effluents were characterized to follow sediment formation, as...
Article
Full-text available
Modeling of refining processes using metal-acid bifunctional catalysts involves an exponentially increasing number of species and reactions, which may rapidly exceed several thousands for complex industrial feedstocks. When building a model for such a process, a priori lumped kinetic models by chemical family do no longer meet the current requireme...
Article
Full-text available
The construction of kinetic models is an important step in the development of refining processes. Indeed, these models can be used to predict the performances of the process, to optimize the operation of a unit and to optimally design a reactor and the associated process (choice of the reactor configuration, determination of optimal operating condi...
Article
Full-text available
The single event modelling concept allows developing kinetic models for the simulation of refinery processes. For reaction networks with several hundreds of thousands of species, as is the case for catalytic reforming, rigorous relumping by carbon atom number and branching degree were efficiently employed by assuming chemical equilibrium in each lu...
Article
Full-text available
In the petroleum industry, the oil fractions are usually complex mixtures containing several hundreds up to several millions of different chemical species. For this reason, even the most powerful analytical tools do not allow to separate and to identify all the species that are present. Hence, petroleum fractions are currently characterized either...
Article
Full-text available
Gas oil cuts are extremely complex mixtures of several thousands of different chemical species. Consequently, conventional petroleum analyses do not allow to obtain the molecular detail that is required for the development of robust and predictive kinetic models. Recently, two-dimensional Gas Chromatographic techniques (GC2D) have greatly improved...
Article
The increasing world demand for clean fuels requires improving existing hydrotreating (HDT) technologies through comprehensive studies of these complex reactive systems. This work presents an exhaustive modeling approach of diesel cut hydrotreating which ranges from the chemical characterization of gas oil feeds, over the HDT kinetic modeling and t...
Conference Paper
Full-text available
Crude oils contain large fractions of heavy products for which only few outlets exist. Refining processes converting heavy oils into more valuable products are therefore vital to a refinery. However, the heaviest cuts, termed residues, also contain the largest amounts of impurities, such as sulfur, nitrogen and metals. Fixed bed residue hydroproces...
Conference Paper
Full-text available
A series of generic algorithms were developed to generate a representative mixture of molecules from standardized petroleum analyses. The idea of these molecular reconstruction algorithms is to create a discrete set of molecules that mimics the properties of the petroleum cut to be represented. The application of such an algorithm to generate a rep...
Article
(1)H DOSY NMR experiments were used to investigate the macrostructure of the asphaltenes of Maya, Athabasca, and Buzurgan feedstocks in toluene-d(s) a 20 degrees C. The influence of the concentration of asphaltenes oil their diffusion coefficients is presented for the three asphaltenes. A separation between two classes of aggregates-one diffusion q...
Article
Molecular reconstruction techniques are methods that allow to create mixtures of molecules from partial analytical data. In this article, a two-step reconstruction algorithm will be presented. The first step, called "stochastic reconstruction" step, assumes that oil mixtures can be described by distributions of structural blocks. The choice of the...
Article
The mean molecular weight and particle size of asphaltene aggregates extracted from Buzurgan feedstock have been evaluated by measuring the diffusivity by means of (1)H diffusion-ordered spectroscopy (DOSY) nuclear magnetic resonance (NMR), This technique, recently applied in the petroleum industry, appeared as a key too] to investigate the behavio...
Article
Getting a better understanding of asphaltene is required to design new catalysts and to develop novel conversion processes but is still a challenge since these macromolecules are composed of thousands of polydisperse molecules. Thus, new analytical techniques need to be developed. 1H-DOSY (Diffusion Ordered SpectroscopY) NMR technique is a powerful...
Conference Paper
The performance of fixed bed residue hydrotreating units was predicted based on a model that accounts for the various physical and chemical phenomena. The porous structure of the catalyst was represented by Random Spheres, Random Needles, and Random Coins models depending on the type of catalyst. The molecular diffusion coefficients were calculated...
Article
Heavy crude oils are more and more of interest for the oil industry to meet the growing worldwide energy demand. Asphaltenes, which are the heaviest and least reactive molecules in crude oils, have received great attention over the last few decades, because they are responsible for many problems occurring during hydrotreatment and hydroconversion....
Article
Ebullated-bed hydroconversion is an important industrial process for upgrading of heavy feedstocks such as residues. The presence of a vapour phase in the reactor can significantly impact the hydroconversion performances, however. Bench unit data were used to collect vapour-liquid equilibrium data under reacting conditions and describe vaporization...
Article
A new method for feedstock reconstruction of industrially important hydrocarbon fractions is developed using as input the analytically determined commercial indices such as the average molecular weight, the specific density, the H/C-ratio, the paraffin, isoparaffin, olefins, naphthenes, aromatics (PIONA) weight fractions and a set of ASTM boiling p...
Article
Residue hydrotreating was studied in a fixed-bed reactor over a wide range of operating conditions and using various feeds. Based on the experimental data, a model was developed to predict the performance of fixed-bed residue hydrotreating units. The reactor model is a heterogeneous one-dimensional plug flow model, which accounts for diffusion insi...
Article
A kinetic model for hydroisomerization of long chain paraffins has been developed by extending the single events modeling methodology to very large reaction networks. The lumped coefficients of the reaction network can now be directly calculated based on a decomposition strategy of the various intervening species into lateral chains and active cent...
Article
The aim of this study is to obtain a model that can simulate the performance of an industrial fluid catalytic cracking (FCC) unit in steady and dynamic state, and which will subsequently be used in studies of control and real time optimisation. In this paper, a dynamic model for a R2R type FCC unit is presented. The model includes the riser, the st...
Article
The aim of this study is to obtain a model that can simulate the performance of an industrial Fluidised Catalytic Cracking (FCC) unit in steady and dynamic state and which will subsequently be used in studies of control and real time optimisation. In this paper, a dynamic model for a R2R type FCC unit is presented. The model includes the riser, the...
Article
To satisfy the increasing propylene demand, direct and indirect naphtha recycling schemes around an existing resid fluid catalytic cracking (FCC) unit were investigated. To this aim, light cracked naphtha (LCN), heavy cracked naphtha (HCN) and a PolyNaphtha (PN) oligomerisation product were cracked under a wide range of operating conditions over a...
Article
With over 300 units in operation, Fluid Catalytic Cracking (FCC) is currently the dominant refinery conversion process. Over the last years, rapid separation of hydrocarbon vapors and catalyst at the riser outlet has been put forward to limit non-selective decomposition of reaction products, thus enhancing product selectivities. A new riser separat...
Article
Reconstruction of petroleum fractions comprises the group of methods that allow to create mixtures of molecules from partial analytical data. In this article, a two-step reconstruction algorithm will be presented. The first step, called "stochastic reconstruction" step, assumes that oil mixtures can be described by distributions of structural block...
Article
Two different algorithms developed to generate a complex mixture of molecules from standard petroleum analyses, i.e., a stochastic reconstruction technique and a reconstruction method based on information entropy maximization, were validated on FCC gasolines and on LCO. A combination of both approaches was applied to the molecular reconstruction of...
Article
The cracking reactions of C6 paraffins (n-hexane, 2-methylpentane, 3-methylpentane, 2,2-dimethylbutane and 2,3-dimethylbutane) over a fluidized catalytic cracking (FCC) catalyst at temperatures between 573 and 923 K have been studied in a temporal analysis of products (TAP) reactor. A mathematical model taking into account the extra- and intra-crys...
Article
The objective of the present work is to determine the influence of the two-phase flow direction in hydrotreating bench scale plants on the axial dispersion of the liquid phase. Residence time distribution experiments under ambient conditions in cocurrent upflow and in cocurrent downflow are carried out in a catalytic hydrotreating bench scale plant...
Article
An inventory was carried out on the capabilities and user-friendliness of commercially available modeling packages aimed at estimation of (kinetic) parameters and capable to describe two or more dimensional reactor models. Four case studies were developed in order to evaluate these packages in more detail. It appeared that all the packages need...
Article
The catalytic cracking of methylcyclohexane over an industrial FCC catalyst(containing Y-zeolite) has been studied in the Temporal Analysis of Products (TAP) reactor. High selectivities towards toluene were observed (Sto1≈70 %). The unusual product distribution originates from a predominant protolytic cracking that is favored by the low pressures a...
Article
Full-text available
Four case studies of kinetic parameter estimations were developed in order to create a thorough inventory of modeling packages suitable for parameter estimation and capable of describing two or more dimensional reactor models. These case studies cover a wide range of problems typically encountered in the chemical industries. Besides parameter e...
Article
Full-text available
Instability of heavy petroleum products and fouling of process units are major industrial concerns. Because of the lack of understanding of their driving mechanisms, better characterisation and deeper understanding of these risks are required. At IFP, the classical characterisation techniques for managing these plugging risks are based on spot test...

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